Dense gas is the key for understanding star formation in galaxies. We present high resolution (∼3′′) observations of CN 2-1 and CS 5-4 as dense gas tracers toward Arp 299, a mid stage major merger of galaxies, with the Submillimeter Array (SMA). The spatial distribution of CN 2-1 and CS 5-4 are generally consistent with each other, as well as HCN 1-0 in literature. However, different line ratios of CS 5-4 and CN 2-1 are found in A, B, and C regions, with highest value in B. Dense gas fraction decreases from IC 694 (A), to NGC 3690 (B) and the overlap starburst region (C and C′), which indicates that circum-nuclear upcoming starburst in A and B will be more efficient than that in the overlap region of Arp 299.
@article{arxiv.2210.02767,
title = {CN 2-1 and CS 5-4 observations toward Arp 299 with the SMA},
author = {Junzhi Wang and Chunhua Qi and Shanghuo Li and Jingwen Wu},
journal= {arXiv preprint arXiv:2210.02767},
year = {2022}
}